Domestic appliance



Gct. 4, 1949. R, R, CANDOR 2,483,526

DOMESTIC APPLIANCE Oct. 4, 1949.. R. R. cANDoR 2,483,526

. DOMESTIC APPLIANCE Filed Sept. 26, 1945 4 Sheets-Sheet 2 @u FIG. 4 KW237 zz- 1 S10 I m FUG.`5

1 FIG INVENTOR.

Oct. 4, 1949. R. R. cANDoR 2,483,526

DOMESTI C APPLINCE Filed Sept. 26, 1945 4 SheetSSheet 3 'BY @Wim Oct. 4,1949. R. R. cANDoR DOMESTIC APPLIANCE Filed Sept. 26, 1945 4Sheets-Sheet 4 4lll z 403, filo FIG.9

FI G. I3 INVENToR.

IDo/sea-r 72 CDA/@oa BY FIG. i2

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Patented Oct. 4, 1949 DOMESTIC APPLIANCE Robert R. Candor, Oakwood,Ohio, assigner to Genera-l .Motors Corporation, Dayton, fOhio, a

corporation :of Delaware Application 'September 2.6, 1'945, Serial No.618,680

(Cl. R19-20) 9 Claims. l

"Iltis invention relates 'to domestic appliances, and :more particularlyto fcontrols `for `electric ranges, v.or the like. obeet of ythisinvention is to provide 'a combined time and thermostatic control :forthe oven of :an electric range, or the like, lin which there is littlevdanger `oi incorrectly manipulating the controls.

Another object of this invention is to provide aeombined time yandthermostatic control for an oven of anelectr'ic range, or the like,which is provided with l'a timer, -a timer thermostat, and -a non-timerthermostat; the arrangement 'being such that, when the timer ismanipulated 'to predetermine a controlled 'heating period, the non-`timer thermostat `is locked in `the fofi position, and, conversely,when the non-timer thermostat fis manipulated to 'place it in atemperature position, then the Itimer iis locked to prevent it frombeing placed in 'a predetermining position.

Another object oi this invention is to provide a control `which includesAa timer, a timer thermost/ait, a non-.timer thermostat; the arrangementbeing such that, when the timer and timer thermostat :ar-e vplaced incontrol, the rnon-'timer thermostat is locked out of control, land viceversa.

Further objects and advantages of the 'present invention will beapparent 'i-romthe following description, reference being had to theaccompanying drawings, wherein a preferred -for-m of 'the presentinvention 'is clearly shown.

ln the drawings:

Fig. l `is a view takenffrom the rear of the control instrument, theView being eross-sectional in parts; l

=Fig. i2 is a front elevation;

Fig. '3 'is ya cross-section taken along the lines 3 3 `O'f Figs. *l and2;

Fig. A2l is a cross-section taken valong the ylines 2%14 of Figs. 1 Iand'2;

Fig. 5 is a cross-section taken along the lines 5 5 'of Figs. 1 and '2;

Fig. 6' is a wiring diagram showing -the control applied to 'thehea-ters 'of `an elec-'tric oven;

Fig. 'lis a view of `a portion of Fig. l6, showing 4a modified form;

Fig. 8 is a iront view 1'of 'another modified 'form of the control;

Fig. 9 is a top view, partly in elevation, of the vcontrol shown 'inFig. 8;

Fig. l0 is a wiring diagram of the control shown in Figs. 8 'and 29, asapplied to an Aoven heating system, `rthe non-timer thermostat being incontrol of the heaters;y

Fig. 11 is la view similar Sto Fig. 410, but showing the timer and timerthermostat in control, fbefore the' predetermined heating period hasstarted;

`Fi'g. 12 is a view similar fto Fig. 11, showing Kthe position of theparts when the predetermined period starts; and

.'Fig. 13 is a view similar 'to Figs. l11 and l2, snowing the parts 'inthe positions when the predetermined period terminates.

Figs. l to 7 'inclusive show the application .of my invention to a timerof the character ydisclosed in the patent to A. R. HuttjNo,'2,310,527,1granted life rnary 9, i943. Figs. 8 to 13 inclusive show the.invention applied to a timer of the character disciosed 'in the patent'to F. Lux, Re. 22,570, granted November 28, 1944. The 'illustration ofthe timers in these 'patents is by way of example, vand not 'with theintention of limiting the invention to the application of these speciiictimers.

' Figs. l "to 'F1 inclus-ive, `the timer shown 'in Hutt Patent 2,310,527is modified by omitting the alarm lcontrol 4l, and the parts used tooperate the alarm. Also fthe Vswitch control l`knob 4"() has beeniomi'tted, together with the parts which are peculiar to the operationfof 'the knob vMl. The remaining parts oi the device -disclosed in theHutt patent are retained, and are numbered with the safme numbers whichlare used in the patent. It is to lbe understood rthat such parts as arenumbered in my application with the sa-me numbers as in the Hutt Patentare intended to oper-ate in the same manner, and have the sameconstruction, being modiiied 7only to the extent necessary v'for theapplication of my invention. It isto be noted that all of the partswhich correspond to those in the patent to Hutt are numbered below 200.The parts which are peculiar to my invention, are numbered between 200and 300. 'Description of the parts numbered below 200 is 'thereforeomitted, and only such description "is given as may be necessary toexplain how the `invention is applied to them.

Briefly, the structure lof the Hutt Patent includes a timer having timeindicators 35, 36, a sta-rit indicator 33, a stop 'indicator 34, asta-rt knob 38, a stop knob 39 and a time set knob 31. XVlren it isdesired to correct the setting of the time indicators, the knob 7 isactuated. When ift is desired -to set the start indicator 33. the startknob 38 is pushed in and rotated until the sta-rt indicator is at thedesired lstarting time. When it is desired to set the stop :indicator34. the stop knob 319 is pushed in and rotated to set 'the startindicator `3'!! at `the desired position. When @he hour indicator 35Icomes into coincidencew'i-th the start indicator 33 (at 3 oclock forexample) the time mechanism picks up the start indicator 33 and carriesit with the hour hand 35. Also the contacts 18, 19 are closed at thistime. When the hour hand or indicator 35 reaches the stop indicator 34(at 6 oclock for example) the time mechanism picks up the stop indicator3d and carries it with the hour hand 35 until such time as a new heatingperiod is predetermined by setting the stop indicator 34 away from thehour hand 35. Also the contacts 13, 19 are opened at 6 oclock.

The mechanism of the Hutt patent is not described in detail, referencebeing made to the patent for detailed description thereof. However, someof the elements which cooperate with my invention will be brieyreviewed. When the start knob 38 is pushed in and rotated, the floatingbar 91 is pushed down (Fig. 3) together with the hub |04. The pin |20 ismoved away from the aperture ||8. Likewise, when the stop knob 39 ispushed in and rotated, the floating bar 91 is lowered at the left end(Fig. 3), together with the hub |05. The pin |2| is moved away from itsaperture ||9 which is not illustrated in this application, but is shownin the patent. As the hour hand 35 comes into coincidence with the startand stop indicators 33 and 34, the pins |20 and |2| respectively comeinto coincidence with the apertures 8 and ||9, and the bar 9'! rises atthe right and left ends of Fig. 3 at the corresponding timesrespectively. The operation is such that the contacts 18, 12, 13 and 10,which are controlled by the bar 91, are maintained open from 2 to 3oclock, are closed from 3 to 6 oclock, and are again opened at 6, in theparticular settings illustrated in this application. Both the hubs |04and |05 are in their lower positions (Fig. 3) from 2 to 3 oclock, thehub |04 rising at 3 oclock, and the hub |05 rising at 6 oclock.

A non-timer thermostat is interlocked with the hubs and 05 in such amanner that the non-timer thermostat cannot be moved from its offposition as long as the time control has its hubs |04 and |05 in theirlower position. Conversely, when the non-timer thermostat is moved awayfrom its off position, the hubs |04 and |05 are locked in their upperposition, so that the timer cannot be set, by means of knobs 38 or 39,to predetermine a heating cycle.

The non-timer thermostat may be any Well known construction. Merely byway of example, the non-timer thermostat may be of the constructiondisclosed in the application of Francis H. McCormick, S. N. 232,592, ledSeptember 30, 1938, and issued July 16, 1948, as Patent No. 2,404,139.rThis non-timer thermostat may be provided with a setting knob 20|(corresponding to 38 of McCormick), which is rotatable, and rotates ashaft 202 (corresponding to ||0 of Mc- Cormick). The shaft 202 actuatesmechanism in box 203, which may include movable contacts 204 and 205(corresponding to 82 and 80 of Mc- Cormick, respectively), which areopened and closed by the diaphragm 205, connected by tubing 201 with abulb 208 (corresponding to 40 of McCormick) placed inside of the oven209 intermediate the top heater 2|0 (24 of McCormick) and lower heater2|| (|82 of McCormick). The knob 20| may have an oi position,temperature positions such as from 150 to 500, and a broil position.When the knob 20| is moved to the broil position, the heater 2|0 aloneis energized; when the knob 20| is in a temperature position (from 150to 500) the lower heater 2|| is energized at full wattage, and the upperheater 2|0 is energized at reduced wattage between the line L1 and theneutral line 2|2, which is in series with the resistance 2|3, preferablyplaced outside of the oven 209. When the knob 20| is rst turned tobroil, and then back to some temperature position, such as 300, thenboth heaters 2|0 and 2|| are energized at full wattage to preheat theoven quickly and then, when the contacts 204 and 205 are first openedwhen the oven reaches 300, then the switch 2|4 (McCormick |62) ischanged in position, so that the upper heater is heated at reducedwattage together with the lower heater 2 at full wattage for theremainder of the heating period. A switch 2|5 (McCormick |35) isprovided which is open only in the broil position of the knob 2| andthus prevents the energization of the lower heater 2 at this time. Thenon-timer thermostat per se forms no part of my invention.

The non-timer thermostat is provided with an interlocking mechanism,which is connected with the hubs |04 and |05 of the timer. For example,the shaft 202 may be provided with a disc 2| 0, xed and rotatabletherewith. It is provided with two at surfaces 2|1 and 2|8. Thesesurfaces cooperate with the bars 2|9 and 220 respectively, which arefulcrumed at 22| and 222 respectively on the plate 2|. The ends 223 and224, respectively of bars 2|9 and 220, are adapted to move into and outof the spaces under (Fig. 3) the hubs |05 and |04 respectively. A spring225 is provided, which tends to rock the bars 2 I9 and 220 towards eachother adjacent the disc 2|6. When the knob 20| fis in the ol position,the disc 2|6 is in the position shown in Fig. 1, with the flat portions2|1 and 2|8 parallel to the bars 2|9 and 220. Under these conditions,the ends 223 and 224 are not under the hubs |04 and |05, and thus thetiming mechanism may be set, by operation of the knobs 38 and 39 anddownward movement of hubs |04 and |05 to predetermine a timed heatingcycle. However, if the knob 20|, of the non-timer thermostat, is movedaway from its off position before the time mechanism is set, then theflat portions 2|1 and 2|8 are moved out of parallel with the bars 2|9and 220, thus rocking these bars about the fulcrums 22| and 222, so thatthe ends 223 and 22!I are moved under (Fig. 3) the hubs 05 and |04respectively. This movement locks the hubs |00 and |05 of the timingmechanism in their upper positions so that the timer cannot be set topredetermine a heating cycle. Conversely, when the time mechanism is setto predetermine a heating cycle, the hub |05 (with or witho-ut the hub|04) is moved to its lower position, thus locking the bars 2|9 and 220in the position shown in Fig. 1. This locks the non-timer thermostat inits off position, since the knob 20| cannot be rotated from its offposition under these conditions. f

A timer thermostat is provided, which is placed in control of theheaters 2 I0 and 2|| jointly with the timer when the timer is set for apredetermined heating cycle. This timer thermostat may be placed inelectrical parallel circuit with the non-timer thermostat. Thearrangement is such that either thermostat can close the circuit to theheaters. However, because of the interlocking arrangement heretoforedescribed, it is not possible for both thermostats to energize orcontrol the heaters at the same time.

The timer thermostat may be of any suitable construction, well known inthe art. It may be menaces :adjustable toppen and close yitsfcontactsbetween 300 and 500, or it may be set permanently at ,some preselect'edtemperature such as r300k or 350, lwhich is generally 4accepted timemeal temperature. Conveniently, it ,may-include contacts 230 and 23|which are opened and closed :by a 'diaph-ragm ,23.2 connected by tube233 4with the bulb 2-34, placed 'in the yoven 2 0-9. conven-:ientlyedjacent the bulb 208. As the oven tem- ,perature r-ises andfalls, the thermostatic liquids .in bulbs 208 and 234 move thediaphragme 206 and 232 respectively to 'open and close their'corresponding I'contacts at the selected tempera-tures, .as isapparent.

y'The .timer thermostat has its contacts 230 and .23| in series with the`contacts 1.2 kand 13 of .the timer. They iare connected to the heaters2I0 and2| i vas shown in Fig. .6.

the modification shown in Fig. '7, the diaphragm 232e, which isconnected by a tube y233e rwith the oven bulb, actuates the contacts13aand 19a to yopen and close them in response to oven temperature. Thecontacts 18a and 10a may be the same asfcon-tactslI and 19 of Fig. 6,except that they are operated by the diaphragm .in addi- 7tion to thepin 81 .of the timer. It is to be understoodthat the yconnecting means235 has a lost motion connection with the spring members 80a and 8| a,.so that the contacts 18a and ISacan be opened by either the timerthermostat or .by f

fthe timer bar |81..

IIn the .operation of the modification shown in fF'g's; 1 to 6inclusive, assume that the non-'timer thermostat is in the orf position,that 'it is '2 foiclcek, and Athat the user desires to predetermin'e 'aheating cycle between 3 and v6y ociock, withatiemperature ci 300 in theoven v20'9. The knob/s 38and 39 are actuated to pl'ac'e .indicators '3'3and v'sa in the position shown in Fig. 2. The timer thermostat knob 236is placed` at 300, ywhich ac'tuates shaft 231 and adjusts the setting bfcdiaphragm 232 in thermostat box V230 vin the Wellkn "In manner. At "2'oclock, the ycontacts 10 and 19 are kept open by the pin 81, asdescribed in the Hutt patent. At 3 o"clocl;, the hub 104 rises, movesbar 91, thus actuating pin B1 and closing cont-acts 4"'Ifi r and 1'9.Since the oven is presumed to be cold, the contacts 230 vand 523-I arealso closed by operation of bulb 253'4 and iliL aphragrn 232. Underthese conditions, current 'can flow from the lines L and L1 throughcon-- tacts it, 11e, 2st, 23| to the heater 2H at Ifuu wattage. Inadsition, current can now through heater iz'lo at reduced, wattage,passing from line Li through ooiiitaets 19 andas! and `line 23s teheater 2m and from thence through line 2th, switch i214., contact 242-,resistance 2If3 to the ineutral y.'ii'z. Baking conditions are thereforeestablished lat 2 oclo'ck. (The construction of the non-timerthermostat, as described in the McCormick application, is such thatswitch 2I4 is in the position shown in Fig. 6 when the knob 20'I is inthe off position.) The heaters 2 I0 and 2H rare now under the control ofdiaphragm 232. 'Ihe contacts 230 and 23| are now closed and opened inresponse to oven temperatures from 3 oclock to 6 oclock. -At 6 oclockthe hub |05 rises, and this actuates pin 81 to openthe `con- .taets 1s.and 1e. Therefore at this time the heaters f2 I0 and -2 I I remaindeenergized until the luser elects to reset the mechanism. If the usershould .elect to use the non-timer thermostat at any time that apredetermined cycle hasnot been set, the knob Vv20| is moved 4from theofi .position to desired position. This movement Vmay .in-v

1 application, etc.

fcludexrctation to the .broil vposition and then to 300, .so that a.preheat cycle, followed by a bake cycle :is produced. In accordancewith the disclosure in the 'McCormick application, this actuation of the`knob 20| causes the contacts 204 and 205 to close, places the contact2I4 `in contact with 24| vand allows 2|'5 to remain closed. Under theselconditions current can ow from power 'source L, Li through contacts tothe .heaters 2110 and 2|I in parallel thus energizing them A at f-ullwattage during the preheating cycle. The .circuit for heater 2II is fromL, contacts 204, 215, 2I5u, heater 2| I, 2|Id, 239, 23911, contact 205land L1. The circuit for heater. 2I0 is from L 'contact 204, 24|, 2M,240, heater 2I0, 2390 205 and Li. When the oven reaches 300., thediaphragm 206 opens the contacts 204 and 205, and this actionsimultaneously moves the contact 2I4 from 24| to 242 as .described inthe McCormick appli-cation. Thereafter, when the contacts 204 and 205are again closed, as the oven cools, the l'current ows from the lines L,L1 to the heater 2H, as previously -described and also from the lineL1., contact 205, 239e, through heater 2I0, line 2,40, contacts 2I-4 and242, resistance 2I3 to neutral 2I2, so that thereafter the heaters 2I-01and 2li are cycled with full wattage in 2II and reduced wattage in2I-0, as more fully described Tin the McCormick application. During allthis time that `the non-timer thermostat has been in `control of theheaters 2I0 and -2II, the contacts 18 and 19 have been kept open by bary81y because the time indicator 35 has been in coincidence with both theindicators 33 and 34.

.In the modiiication shown in Fig. 7, the circuits are th'e same as inFig. 6 except that the contacts 230 and 23| of Fig. 6 are omitted, sincecontacts 10a and 10a serve the double function of contacts 230, 23|, 18and 10.

In the modification shown in Figs. 8 through 12, the invention isapplied to the structure Adisclosed 'in the patent to F. Lux Re. 22,570.The parts in this application which correspond :to the yparts of the Luxpatent are numbered with the .same :number as in the Lux patent with thesuffix -3 added. For example, the case I0 of the Lux reissue patent isindicated by 3 I0 in this application. The clock hands I2 and I3 of theLux patent are indicated 'at SI2 and -3-I3 in this It is to be notedthat all of the parts in this application vcorresponding to parts in theLux patent rare numbered between 300 and 400. The parts which have beenadded, ymodified or changed in this application over l the Lux patentare numbered above 400.

The following structures of the Lux reissue patent are modi-hed: The oiivand set manipulating button 84 of the Lux patent operates the same thisapplication, except that the pointer 404 in this application pointsdownwardly in the -offf position instead of upwardly as in the patent.rIihe shaft 10 of the Lux patent is provided with'a `learn 402 Vofdifferent shape from the cam 89 of the patent. It is alsoprovided with asecond cam 403 which is additional to that shown in the patent. Thecontacts y331 and 300, which are actuated by the cam 02 are connected toa non-timer thermostat 006i, which may be substantially the same as thenon-timer thermostat disclosed in the McCormick appl-io'a'tion describedwith respect to Figs. 1 to 6, which may be provided with a rota-tableknob 005 j'(c'or-respending to McCormick knob 38) movabie to temperaturesettings from 4an off Dosition and also .movable to a brei-1 position.The

additional cam 403 is adapted to open and close contacts 406 and 401(which are inwardly sprung similarly to 381 and 388) upon stationarycontacts 400 and 409 respectively. The stationary contacts 408 and 409are connected electrically with the lines L1 and L respectively and alsowith the stationary contacts 385 and 386 respectively. rEhe electricalconnection between 408 and 305 is indicated by 410 and the connectionbetween 406 and 386 by 4i I. These connections may actually be made byconnector screws 4l0a and 4|Ia, shown in Fig. 9. The cams 402 and 403are shaped as illustrated so that they close their respective contactsat only one of four positions during the intermittent rotation of thecontrol knob 384.

The non-timer thermostat knob 405 is provided with interlocking meanswith the oir and set knob 334 so that one or the other of the knobs hasto be at the off position when the remainingT knob is moved away fromthe oil position. To this end, the knob 405 may be provided with acircular recess 4I2 and the knob 304 may have a circular recess 413.When the knob 405 is moved away from the off position, as shown in Fig8, the knob 401 cannot be moved from the orf position because the edgesof the recess 413 strike against the edge of the knob 405.

A timer thermostat 415 may be provided and may have an adjusting handle416 substantially the same as timer thermostat in the modification ofFigs. 1 to 6. This thermostat may be provided with a diaphragm 4l1 whichopens and closes contacts 418 and 4l9 through the medium of bulb 420 inresponse to temperatures within the oven 42E. The thermostat 404 hascontacts 422 and 423 opened and closed by the diaphragm 424 through themedium of bulb 425 in response to temperatures within the oven 421. Anupper heater 426 and a lower heater 421 are placed in the oven. Thecontacts 406 and 401 are connected with the stationary contacts 428 and429 of the thermostat 415. The contacts 381 and 386 are connected withthe stationary contacts 430 and 43| of the non-timer thermostat 404.

As in the Lux patent, the knob 384 can be moved 135 degrees clockwisefrom the on" position when it is desired to set the timer in control ofthe oven. When the hour hand 3I3 reaches the on time (4 oclock forexample), the knob 384 snaps 45 degrees from its on position, snapsanother 45 degrees when the hour hand reaches 6 oclock, and remainsthere indefinitely until the user elects to move it to the oiT positionor back to the on position.

In the operation of the modification shown in Figs. 8 through 13, assumethat the user desires to bake under non-timed conditions at 400. Shemoves the knob 384 to the off position (if not already there) as shownin Fig, 8, with the pointer 40! down. She also moves the nontimerthermostat knob 405 to 400 as shown in Figs. 8 and 10. Under theseconditions, the cam 402 closes the contacts 381 and 388 and cam 403opens the contacts 406 and 401. Under these conditions current can flowfrom the lines L, L1 to the lower heater 421 to energize it at fullwattage. Also current can ow through the upper heater 426 at reducedwattage flowing from L1 to the upper heater 426 and from thence throughline 440 through resistance 440a to the neutral 44|. This energizes thelower heater at reduced wattage to produce baking conditions which aremaintained at 400 by opening and closing the contacts 422 and 423 inresponse to oven temperatures.

Assume now that, at 11 oclock the user wishes to have a predeterminedheating cycle from 4 to 6 oclock, with a temperature of 300. She setsthe handle 416 at 300, places the on indicator at 4 oclock, the offindicator at 6 oclock, and moves the knob 384 to the on position degreesclockwise from the 011 position (before she can do this, the knob 405must be in the off position). The conditions just described are shown inFig. 1l. Under these conditions the cams 402 and 403 open all circuitsto the lines L, L1 by opening the contacts 381, 383, 406 and 401.Nothing can be energized until 4 oclock. When the hour hand 3|3 reaches4 oclock, conditions are established as shown in Fig. 12. The knob 304has snapped 45 degrees counterclockwise. The cam 403 closes the contacts406 and 401, whereas the cam 402 still allows the contacts 381 and 388to remain open. Current can now flow from the lines L, L1 to the lowerheater 421 at full wattage through the thermostat 4l5. In addition,current can flow at reduced wattage through heater 426 from the line Lito the upper heater 426 and from thence through 440 and 44| to theneutral 44|. Under these conditions the lower heater is energized atfull wattage and the upper heater at reduced Wattage. Both heaters arecycled through the medium of bulb 420 and diaphragm 4l1 to maintain theoven at 300 from 4 oclock to 6 oclock. At 6 oclock, the knob 384 snapsanother 45 degrees counterclockwise to the position shown in Fig. 13.Under these conditions the cams 402 and 403 cause or allow the contacts381, 388, 406 and 401 to be open, thus disconnecting all of the heatersfrom the lines L and L1. The system remains in this condition until suchtime as the user elects either to reset a predetermined heating cycle,in which case she would move the knob 384 to the on position, or, if sheelected to establish a non-timed heating cycle, she would move the knob384 to the oi position and the knob 405 to the selected position.

1t is to be understood that the thermostat 404 may be any well knownthermostat or may be of the character disclosed in the aforementionedMcCormick application. If of the McCormick type, the knob 405 can bemanipulated for bake, broil, and preheat conditions as more fullydisclosed in that application. In the broil position, contact 440D(corresponding to |62 of McCormick) will move from the positionillustrated to contact 423a, while switch 423e (corresponding to |36 ofMcCormick) will move away from 423a.

While the form of embodiment of the invention as herein disclosed,constitutes a preferred form, it is to be understood that other formsmight be adopted, as may come within the scope of the claims whichfollow.

What is claimed is as follows:

1. A control for electric ranges, or the like, comprising a timeradapted to establish a predetermined heating cycle and havingpredetermining and non-predetermining positions, a timer thermostat,said timer and timer thermostat adapted jointly to connect anddisconnect heating means to a power source with said timer thermostatacting in response to temperatures created by said heating means duringsaid predetermined heating cycle, a non-timer thermostat having olf andheating temperature positions, adapted to connect and disconnect saidheating means in response to temperatures created by said heat- "9 ingmeans, and means responsive Ato the setting-of said non-timer thermostatin temperature *posi-c tion for locking' said timer in saidnon-predetermining position while said timer is in non-predeterminingposition.

2. A control for electric ranges, or the like, comprising a timeradapted to establish Ia predetermined heating cycle and havingpredetermining and non-predetermining positions, a timer thermostat,said timer and 4timer thermostat adapted jointly to connect anddisconnect heating kmeans to a power source with said timerthermostatacting in response to temperatures created by said heatingmeans during said pre"- dete'rmined heating cycle, a non-timerthermostat having o'if and heating temperature positions adapted toconnect anddisconnect said heating means in response to temperaturescreated by said* heating means, and means responsivefto the setting 'ofsaid timer in predetermining position while said non-timer thermostat isin off position for locking said non-timer thermostat in said offposition;

3. A control for electric ranges, or the like, comprising a timeradapted to establish ya predetermined heating cycle, said timer hav-inga time indicator, a start indicator and a stop indicator, said stopindicator being movable from coincidence with said time indicator toestablish said cycle and locking with said time indicator as it comesinto coincidence with said stop indicator, to start and stop said cycle,a timer thermostat, switch means controlled jointly by said timer andtimer thermostat to connect and disconnect a power source and heatingmeans during said heating cycle with said timer thermostat acting inresponse to temperatures created by said heating means, a non-timerthermostat having off and temperature positions to connect anddisconnect said heating means and power source in response totemperatures created by said heating means, and means responsive to thesetting of said non-timer thermostat in temperature position while saidswitch means is in disconnected position for locking said switch meansin said disconnected position.

4. A control for electric ranges, or the like, comprising a timeradapted to establish a predetermined heating cycle, said timer having atime indicator, a start indicator and a stop indicator, said stopindicator being movable from coincidence with said time indicator toestablish said cycle and locking with said time indicator as it comesinto coincidence with said stop indicator, to start and stop said cycle,a timer thermostat, switch means controlled jointly by said timer andtimer thermostat to connect and disconnect a power source and heatingmeans during said heating cycle with said timer thermostat acting inresponse to temperatures created by said heating means, a non-timerthermostat having off and temperature positions to connect anddisconnect said heating means and power source in response totemperatures created by said heating means, and means responsive to thesetting of said stop indicator in heating cycle predetermining positionwhile said non-timer thermostat is in off position to lock saidnon-timer thermostat in said off position.

5. A control for electric ranges, or the like, comprising a timeradapted to establish a predetermined heating cycle, said timer having atime indicator, a start indicator, a stop indicator and an off and setindicator, said stop indicator and off and set indicator being 'movableto establish a pre'- determined heating cycle, a timer thermostat,switch means' controlledjointly by said timer and timer thermostat toeon'i'iect and v'dis'ct'in'nect a power source and heating 'means duringsaid heating cycle with said timer thermostat acting in response toytemperatures created 'by said heating means, a non-timer thermostathaving ori and tempeatllll'e p0 tio'llS t0 cOllle'ct and disconnect saidheating means and 'power source in response to temperatures created by'said heating means, and 'means responsive to the setting of saidnontimer thermostat a temperature position while said on and setindicator "is in oir position for locking said orf and set indicator linsaid on position.

'6. A control r'el'ectric ranges, orthe like, comprisinga timer adaptedto establish a predetermined heating cycle, said timer having a timeindicatoi, 'a start indicator, a stop indicator and an off andsetindicator, said stop indicator and oi and set indicator being movableto establish a predetermined heating cycle, a timer thermostat, switch'means controlled jointly by said timer and timer thermostat to connectand disconnect a power sodrce" and heating means during said heatingcycle with said timer'thermostat acting in 'response to temperaturescreated by 'Said heating means, a non-timer thermostat having off andtemperature positions to connect and disconnect said heating means andpower source in response to temperatures created by said heating means,and means responsive to the setting of said oi and set indicator in setposition while said non-timer is in off position to lock said nontimerthermostat in said ofi position.

7. A control for electric ranges, or the like, comprising a timer havingtimer setting means movable to heating cycle predetermining andnonpredetermining positions, a timer thermostat, switch means connectingand disconnecting a power source to and from a heating means, said timerand timer thermostat jointly opening and closing said switch meansduring a predetermined heating cycle with said timer thermostat actingin response to temperatures created by said heating means when saidsetting means is in cycle predetermining position and maintaining saidswitch means in open circuit position when said setting means is innon-predetermining position, a nontimer thermostat having off andtemperature positions adapted to connect and disconnect said powersource and heating means in response to temperatures created by saidheating means, and means responsive to the setting of said non-timerthermostat in temperature position while said switch means is in opencircuit position for locking said switch means in open circuit position.

8. A control for electric ranges, or the like, cornprising a timerhaving timer setting means movable t0 heating cycle predetermining andnonpredetermining positions, a timer thermostat, switch means connectingand disconnecting a power source to and from a heating means, said timerand timer thermostat jointiy opening and closing said switch meansduring a predetermined heating cycle with said timer thermostat actingin response to temperatures created by said heating means when saidsetting means is in cycle predetermining position and maintaining saidswitch means in open circuit position when said setting means is innon-predetermining position, a nontimer thermostat having off andtemperature positions adapted to connect and disconnect said powersource and heating means in response to temperatures created by saidheating means, and means responsive to the setting of said non-timerthermostat in temperature position while said timer setting means is innon-predetermining position for locking said timer setting means in saidnon-predetermining position.

9. A control for electric ranges, or the like, comprising a timer havingtimer setting means movable to heating cycle predetermining andnonpredetermining positions, a timer thermostat, switch means connectingand disconnecting a power source to and from a heating means, said timerand timer thermostat jointly opening and closing said switch meansduring a predetermined heating cycle with said timer thermostat actingin response to temperatures created by said heating means when saidsetting means is in cycle predetermining position and maintaining saidswitch means in open circuit position when said setting means is innon-predetermining position, a nontimer thermostat having oi andtemperature positions and non-timer switch means actuated by saidnon-timer thermostat adapted to connect and disconnect said power sourceand heating means in response to temperatures created by said heatingmeans, and means responsive to the setting of said timer setting meansin heating cycle predetermining position while said non-timer ther- 12mostat is in off position for locking said non-timer thermostat in said01T position.

ROBERT R. CANDOR.

REFERENCES CITED The following references are of record in the le ofthis patent:

UNITED STATES PATENTS Number Name Date Re. 22,570 Lux Nov. 28, 19441,188,734 Clement June 27, 1916 1,745,420 Hewitt Feb. 4, 1930 2,065,844Wattles, 3d Dec. 29, 1936 2,088,728 Stranszky Aug. 3, 1937 2,101,430Goldbert et a1 Dec. 7, 1937 2,266,149 Biebel Dec. 16, 1941 2,266,257Osterheld Dec. 16, 1941 2,310,527 Hutt Feb. 9, 1943 2,331,535 CandorOct. 12, 1943 2,392,166 Lockwood Jan. 1, 1946 2,402,787 Stickel June 25,1946 2,416,084 Candor Feb. 18, 1947 FOREIGN PATENTS Number Country Date493,379 Great Britain Oct. 7, 1938

